fix build on at least linux

git-svn-id: https://leveldb.googlecode.com/svn/trunk@25 62dab493-f737-651d-591e-8d6aee1b9529

table/block.cc

@@ -62,7 +62,7 @@ static inline const char* DecodeEntry(const char* p, const char* limit,
     if ((p = GetVarint32Ptr(p, limit, value_length)) == NULL) return NULL;
   }
 
-  if (static_cast<uint32>(limit - p) < (*non_shared + *value_length)) {
+  if (static_cast<uint32_t>(limit - p) < (*non_shared + *value_length)) {
     return NULL;
   }
   return p;